Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 42, Problem 6TY
Which of the following contribute(s) to the resting membrane potential?
- a. the relative leakiness of the membrane to Na+ and K+
- b. active transport of ions across the membrane
- c. concentration of Na+ and K+ inside and outside of the cell
- d. all of the above
- e. b and c only
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The resting membrane potential results fromA. uneven distribution of ions across the cell membrane only.B. differences in membrane permeability to Na+ and K+ onlyC. activity of the sodium/potassium pump only.D. uneven distribution of ions across the cell membrane, differences in membrane permeability to Na+ and K+, and sodium/potassium pump activity
The membrane potential across a cell membrane can be thought of as a "blend" or weighted average of
a. the concentrations of Na+ and K+ ions in the extracellular fluid
b. the concetrations of Na+ and K+ ions in the cytoplasm
c. the concentrations of all permeable ions in the cytoplasm
d. the membrane potenial before and after the action potential
e. None of the above answer choices correctly completes the sentence
factors responsible for a negative resting membrane potential include:
check all that apply:
a. Na K pump
b. different carrier proteins
c. uneven distribution of ions
d. difference in permeability of ions
e. high potassium concentration in ECF
Chapter 42 Solutions
Biology
Ch. 42.1 - Prob. 1CCCh. 42.2 - Prob. 1CSCh. 42.3 - Prob. 1CSCh. 42.3 - Prob. 2CSCh. 42.3 - Prob. 1CCCh. 42.3 - Prob. 2CCCh. 42.4 - What key prior observation led Loewi to develop...Ch. 42.4 - CoreSKILL The results of Loewis experiment...Ch. 42.4 - Prob. 3EQCh. 42 - Prob. 1TY
Ch. 42 - Prob. 2TYCh. 42 - The myelin sheath a. is produced by neurons in the...Ch. 42 - Prob. 4TYCh. 42 - Prob. 5TYCh. 42 - Which of the following contribute(s) to the...Ch. 42 - Prob. 7TYCh. 42 - Prob. 8TYCh. 42 - Prob. 9TYCh. 42 - Prob. 10TYCh. 42 - Prob. 1CQCh. 42 - Prob. 2CQCh. 42 - Prob. 3CQCh. 42 - Describe the difference between an electrical...Ch. 42 - Prob. 2COQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which of the following contribute(s) to the resting membrane potential?a. the relative leakiness of the membrane to Na+ and K+b. active transport of ions across the membranec. concentration of Na+ and K+ inside and outside of the celld. all of the abovee. b and c onlyarrow_forwardPlasma membrane permeability of which of the following ions is most important in generating the resting membrane potential? Select one: A. chloride ions B. sodium ions C. None of the options generates resting membrane potential O D. potassium ions O E. calcium ionsarrow_forwardwhich of the following statements is false with regard to cell electrical impulses? a. an impulse begins when chloride ions are allowed to rush inside the cell b. depolarization is when the relative charges across the membrane have switched due to ions crossing the membrane c. repolarization refers only to the relative charges across the membrane being restored, even when the ion balance is not returned to normal yet d. ionic balance is brought back to resting potential by the sodium-potassium pumpsarrow_forward
- Which of the following statements about membrane ion channels is incorrect? a. mechanically gated channels respond to physical deformation b. ligand-gated channels respond to neurotransmitters c. voltage-gated channels respond to changes in membrane potential d. leakage channels have gates and are always open e. none of the abovearrow_forwardThe most important diffusible ion in the establishment of the membrane potential is a. K+. b. Na+. c. Ca2+. d. Cl−.arrow_forwardResting membrane potential: a. Is due to difference in permeability of cell membrane to ions b. Is determined by the different concentration of ions across the cell membrane c. All of the above. d. Is negative change inside the cell membrane.arrow_forward
- Mark the following statements as true or false. If a statement is false, correct it to make a true statement. a. The resting membrane potential refers to the voltage difference across the membranes of excitable cells at rest. b. The concentration of Na+ is highest in the cytosol, and the concentration of K+ is highest in the extracellular fluid. c. The Na+>K+ pumps and gated channels maintain the Na+ and K+ gradients necessary for action potentials to occur. d. A depolarization is a change in membrane potential that makes the potential less negative. e. A local potential is a change in membrane potential that conducts the long-distance signals of the nervous systemarrow_forwardWhich of the following statements is false regarding the directions that forces of the eletrochemical gradient are pointing for each ion. Assume the membrane of the neuron is at rest. A. For chloride ions the electrostatic and diffusion forces are pointing in opposite directions. B For sodium ions the eletrostatic and diffusion forces are pointing in the same direction. C. For potassium ions the eletrostatic and diffusion forces are pointing in opposite directions. D. All options choices are TRUE regarding the forces of the electrochemical gradient on each ion. E. For calcium ions the electrostatic and diffusion forces are pointing in opposite directions.arrow_forwardWhich of the following primarily reflects the opening of voltage-gated Na+ channels? A. The resting membrane potential B. The depolarization phase of the action potential C. The threshold potential D. The repolarization phase of the action potential E. All of the abovearrow_forward
- An 82-year-old woman is brought to the emergency room complain- ing of nausea, vomiting, muscle cramps, and generalized weakness. Labo- ratory analysis reveals significant hyperkalemia. Elevations of extracellular potassium ion concentration will have which of the following effects on nerve membranes? a. The membrane potential will become more negative b. The sodium conductance will increase c. The potassium conductance will increase d. The membrane will become more excitable e. The Na*-K* pump will become inactivatedarrow_forwardWhich of the following statements about hyperpolarization is true? a. it is not an increase in membrane potential b. causes the voltage of the internal membrane towards zero c. inside the membrane becomes more positive than resting potential d. lowers the probability of producing an action potential e. none of the abovearrow_forwardPlasma membrane permeability of which of the following ions is most important in generating the resting membrane potential? Select one: OA. calcium ions O B. chloride ions OC. potassium ions O D. None of the options generates resting membrane potential OE sodium ionsarrow_forward
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